What does a bird have for a forelimb?
A bird has a wing as a forelimb as well as a bat, and the function of both are to help the animals fly
Why are dinosaurs eggs so big?
In order to propagate the species, most dinosaurs had to lay multiple eggs. They did this to make sure at least some of their babies survived predators and weather events.
What are the three types of evolution?
1. Directional selection
2. Disruptive selection
3. Stabilizing selection
If you need to know more about them then just research. Trust me, it's easier to look it up than it is to ask the question.
Are humans creations or did we undergo evolution?
In recent years, many excellent books have been published detailing scientific findings and conclusions that I believe compellingly demonstrate the impossibility of evolution as an explanation for the intelligent life on earth. Futhermore, evolution cannot offer an explanation for the origin of our magnificent universe as evolution only seeks to explain how it 'might' have begun in an universe that already existed. With the flood of new discoveries in the universe, microbiology, and many other of the sciences, evolution is at a loss to fully explain these.
The Scripture on the other hand is quite straight forward. In Genesis 1:27 it says, "So God created man in His own image; in the image of God He created him, male and female He created them." So we humans reflect the God beings, in effect "we are the offspring of God" (Acts 17:29).
In short, being created in God's image is what makes us human and of a different "kind" than animals. While the 'theory' of evolution describes early man as only being capable of crude grunts, the first chapter of the book of Genesis show Adam and Eve immediately after their creation being able to name the animals, communicate in complete sentences and reason for themselves whether to obey God's instructions to not eat of the tree of the knowledge of good and evil.
Our ultimate purpose is that we were created to be of the "God kind." Although God has made us physical beings for now, His ultimate desire is that all men and women accept His authority over their lives and eventually become part of His eternal family as literal children (John 1:12; 2 Corinthians 6:18).
It is an individual's choice :)
When did the marine mammals evolved from land ancestors?
The ancestors of cetaceans began to move into the water and develop aquatic characteristics about 50 million years ago. They have been evolving ever since, gradually becoming more and more aquatic. Today's cetaceans live entirely in water. The ancestors of pinnipeds began moving into water much more recently, about 23 million years ago. Because of this, modern pinnipeds are not as fully aquatic as cetaceans. The ancestors of sirenians began moving into the water about 40 million years ago, and have been evolving since then.
What are examples of post-Darwin evidence for evolution?
Good question. Evolution is like, well did you ever throw a piece of trash on the groud? Than if the rest of us did to in that same spot. It changes the earth and trees, flowers, and grass might die. But I think the trick is pictures.
~Amythefairy
What is the process called when allele frequencies in a population of a species change over time?
Evolution; the change in allele frequencies over time in a population of organisms.
In areas where there are elk, they force the elk to move around and to be on guard. This is good for vegetation, because without the fear of being eaten, elk will ravish one area before moving on. If they destroy much of the vegetation in an area (specifically the deciduous trees), they eliminate shade needed by fish in streams, make food source harder to find for beavers, which, without their dams, disrupts other stream life. Fewer or no wolves means more deer. More deer means more problems with deer within human settlements. Fewer wolves mean more human run-ins with mountain lions, since they will have little reason not to come down from the high country.
In hunting they tend to kill the weaker and sick members of the herds they hunt; leaving the stronger ones alive giving them a better chance to live and breed
What is an example of co-evolution in a ocean?
Whales and Sharks are examples of coevoultion. they have very similar body shapes despite only being remotely related.
Where did early men and women live?
Human kind developed in central Africa over the course of billions of years. Roughly sixty to one hundred thousand years ago, groups of humans began to migrate out of Africa toward the east and north. We spread out from there in a vast expanding migration until we reached all of the habitable places on the planet. Check the Genographic Project and send them a DNA sample (there is a cost) to learn about the journey your genes followed. I am not affiliated in any way with the Genographic Project, except that I have sent them my DNA.
This is based on an individuals opinion, since this question is a very biased and opinionated question. Some people think that pigs are ugly because they believe they are dirty, since they like to roll around in mud and use their powerful noses to root around in the dirt. These same people also believe that pigs are ugly because they have almost no neck, are short, squat and fat, etc. But there are others who don't think pigs are ugly, because they see that pigs are, in reality, clean animals since they defecate and urinate in a spot away from their feeding and resting area, and they cool themselves in the mud because they have no other ways of cooling themselves, and that pigs are just as smart as a dog, if not smarter.
So all in all, this question is based on one's opinion and only that.
Why is Archaeopteryx in the theory of evolution?
Well, if you look at the skeleton of a modern bird, you will see that it has many similarities with small bipedal theropods such as Coelurus and Compsognathus. For examle, many theropods have hollow bones and even wishbones, a unique feature to birds. Also many species are covered head to toe in feathers! The unique fossilization process that allows such detail to be preserved is found the most in Liaoning, China, where most of the known feathered dinosaurs have been found. My theory is that a small, possibly tree living Coelurosaurid theropod branched out into the group Paraves (Eumaniraptora), the family that includes birds and Deinonychosaurs such as Velociraptor. All this group are very similar anatomically. The first certain bird, Archaeopteryx, shared many features with both birds and dinosaurs. It is used for the basis for bird evolution, and although another, Protoavis, evolved earlier, it is not yet agreed to be a true bird and is thought to be a chimera (Mix of two or more animals fossilized together and viewed as the same creature)
Why is archaeopteryx important in the theory of evolution and what evidence it can prove?
It was important because Darwin's theory of evolution predicted the existence of "transitional" fossils; evidence that animal groups (in archaeopteryx's case) such as birds and reptiles had common ancestors. Archaeopteryx had feathers, like modern birds, but also teeth and a bony tail - which no modern bird has.
It was also important because of the timing of its discovery; Darwin's On the Origin of Species was published in 1859, in 1861 the first complete specimen of archaeopteryx was discovered (a feather had been discovered earlier). It provided such timely and compelling supportive evidence that some people claimed it was a fake. Since then, 9 further specimens have been found - essentially ruling out that possibility.
How do fossils support the ideas of common ancestry and evolution?
Fossils are preserved remains or imprints of organisms that are formed in rock layers. When an organism dies, sediments may form on top of it, burying and preserving it. Another organism may die on top of it and also be buried. Eventually, many different rock layers (also known as strata) are formed with fossils inside them. So we can say that the lower the strata, the older the rock and fossil. The higher the strata, the younger the fossil. This is because new rocks and fossils form on top of older ones. When studying the fossils found in different strata, scientists found that the older ones were a lot more simpler. This means that fossils formed millions and millions of years ago were once very simple organisms. As they observed fossils higher up in the different strata, they noticed that there were similar fossils but they were a little bit more developed and complex. The newest fossils found resembles organisms that exist today. This shows that organisms were once very simple, but, with time, became more complex and better suited for survival in particular conditions. This is known as evolution.
The fossil record is only one of many types of evidence for evolution.
Why did humans come from monkeys?
There are a few critical distinctions between humans and apes:
Humans walk upright, apes are generally knuckle walkers (they walk on all fours but on the knuckles of the hands).
Humans can hold their breath. No ape can do that - this is to do with the way the tubes in the throat are arranged and it also means that it possible for humans to talk - the downside is that food can "go down the wrong way".
Humans have much less hair - they are practically naked.
Unfortunately, these important differences are not the kind of thing that fossilise well - apart from the walking upright. The well known Lucy fossil was an upright walker, but, of course, it's difficult to explain why a creature started walking upright apart from the vague "there was an environmental advantage".
There is a theory that explains pretty much all of these; that early hominids spent a period as "aquatic apes" - this would explain why we can hold our breath, lost our body hair and - more tentatively - why we walk upright. The only problem with the theory is that there is no fossil evidence to support it.
Another answer--The evidence is that humans and apes shared a common ancestor, not that they evolved from apes.
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The difficulty is tracing the lineage stems from not just body details failing to leave fossils. The Quaternary land animals generally - including our ancestors - left far fewer good fossils than sea creatures. Notably, our own species is poorly defended physically from animal attacks or extreme weather, and poorly equipped bodily to hunt and kill live prey. We had to develop an intellect and vocal skill some orders of magnitude higher than those of any other animal so we could overcome these weaknesses by brain rather than brawn.
What area is gibberellin produced?
They are synthesized in plasmids and modified in the endoplasmic reticulum.
Why are certain dinosaurs thought to have been related to birds?
Tyrannosaurus belonged to the clade Coeluosauria. Coelurosauria includes birds, maniraptorans, and Tyrannosaurs. However, birds did not descend from Tyrannosaurus or any of its immediate relatives.
What is a vestigial structure on modern whales?
Some still have embedded pelvises under a good bit of blubber.
Why is the harpy eagle's exisence threatened by land developers?
From hunting and deforestation. Some farmers think that harpies could be a threat to livestock, and so they are shot quite a bit in the jungle. They have now gone extinct from most of Mexico and Paraguay.
Why do sea otters have large sensitive whiskers?
Sharp teeth make a seal better able to hold onto its catch of fish (which can be very slippery when they wish).
What is the shape of a spider's chelicerae?
It would either have to be a hexagon or an octagon. I'm not a hundred percent sure.
What are 3 events that can lead up to speciation?
Isolation often leads to speciation, because as each isolated population evolves new characteristics, the separate populations eventually get DNA that is too different for the two to breed and have fertile offspring (this is the point when speciation has occurred). In the case that there is not isolation, the whole species must slowly evolve until it becomes a new species. However, here the line between where the speciation actually occurred becomes blurry, because it doesn't happen in a single generation.
What do birds excrete nitrogenous waste mostly in the form of?
Unlike mammals (which create urea) birds turn nitrogenous wastes into uric acid.
This conserves water - as uric acid can be excreted as the thick white substance which is familiar in bird droppings. For mammals, urine consists of urea dissolved in water.
Were plants or humans on earth first?
Actually, this would be bacteria, because it is how all organisms start out and eventually, they will evolve into the animals and plants we know today. However, humans did not come about until around after the Ice Age, along with the first mammals.
How would Lamarck have explained the length of a giraffe's neck?
because their ancestors stretched their necks reaching for food